Search results for "Superplasticity"

showing 3 items of 3 documents

Application of linear friction welding for joining ultrafine grained aluminium

2020

Abstract Ultrafine grained (UFG) materials are of great potential in industry due to their enhanced mechanical strength and other promising features, such as ability to superplastic deformation or excellent corrosion resistance. Nevertheless, one of the main limitations lies in their low thermal stability, which leads to excessive grain growth at elevated temperature. It influences mainly further processes performed at high temperature, such as joining. It causes detrimental problems during conventional fusion welding, as significant grain growth is observed and therefore the advantages as a result of small average grain size disappear. Therefore, the idea of applying solid state joining pr…

0209 industrial biotechnologyMaterials scienceStrategy and ManagementMetallurgySuperplasticity02 engineering and technologyWeldingManagement Science and Operations Research021001 nanoscience & nanotechnologyIndustrial and Manufacturing EngineeringGrain sizelaw.inventionGrain growthFusion welding020901 industrial engineering & automationSevere plastic deformationlawUltimate tensile strengthAluminiumFriction weldingUltrafine grained microstructureDeformation (engineering)0210 nano-technologyLinear friction weldingSettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneJournal of Manufacturing Processes
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Welding abilities of UFG metals

2018

Ultrafine Grained (UFG) metals are characterized by an average grain size of <1 μm and mostly high angle grain boundaries. These materials exhibit exceptional improvements in strength, superplastic behaviour and in some cases enhanced biocompatibility. UFG metals barstock can be fabricated effectively by means of Severe Plastic Deformation (SPD) methods. However, the obtained welded joints with similar properties to the base of UFG material are crucial for the production of finished engineering components. Conventional welding methods based on local melting of the joined edges cannot be used due to the UFG microstructure degradation caused by the heat occurrence in the heat affected zone…

Heat-affected zoneMaterials scienceRecrystallization (metallurgy)SuperplasticityUltrafine Grained (UFG) Linear Friction Welding (LFW) Severe Plastic Deformation (SPD) Rotary Friction Welding (RFW) Friction Stir Welding (FSW)WeldingMicrostructurelaw.inventionlawGrain boundaryFriction weldingSevere plastic deformationComposite materialSettore ING-IND/16 - Tecnologie E Sistemi Di LavorazioneAIP Conference Proceedings
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Role of Diffusion in Superplasticity and Brittleness of Fine-Grained Binary Eutectics

2005

Mechanical properties of interphase boundaries (IB), stability of defects and microstructure in heavily deformed binary eutectics (Al-Sn, Zn-Sn, Pb-Sn, Cd-Sn, Bi-Sn) have been investigated at room temperature. Experiments were carried out on atomically clean surfaces of alloys and on bimetallic joints with clean interface. It has been shown that after severe deformation the phases are strengthened and relaxation processes occur mainly on the boundaries in all eutectics. For superplastic eutectics with low interphase boundary energy the intensive development of the diffusion – controlled processes of self- healing, sintering, segregation and enveloping were observed. These diffusion processe…

Surface diffusionRadiationMaterials scienceDiffusionMetallurgySuperplasticityCondensed Matter PhysicsMicrostructureBrittlenessGeneral Materials ScienceInterphaseDeformation (engineering)Composite materialEutectic systemDefect and Diffusion Forum
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